Patent GB-191405716-A (GB)
Title: Improvements in and relating to Sewing Machines.
IPC: D05B27/02
Filed: 1914-03-06
Granted: 1915-03-04
Abstract: 5716. Debenhams, Ltd., and Holder, H. March 6. Intermittent - stitching machines; threadcutters; feed by dog.-Sewing-machines are constructed so that any required number of stitches may be made, the thread cut, and the material fed forward without the insertion of stitches for any required distance, means being also provided whereby continuous stitching or continuous feeding without stitching may be effected. The driving-shaft 1, Fig. 2, is provided at its front end with the usual projection for actuating the feeding-device 4, which may be combined with a second feeder 5, Fig. 6, formed at the end of a lever 6, pivoted to the plate 8 of the feeder 4 and provided with a slotted end working over a fixed pin 10. The presser foot 12 is provided with serrated rollers 13, and with a secondary presser 14. The feeder 5 preferably operates slightly in advance of the feeder 4, and the presser 14 may be so mounted as to be capable of being turned out of action. The machine is provided with a needleactuating shaft 20 driven from the shaft 1 by suitable clutch connexions, which may comprise a sleeve 28 slidably mounted on the shaft 20 and provided with a projection 30, which is engaged by a projection 27 on the boss 26 of a driven gear-wheel 19 loose on the shaft 20, when the sleeve 28 is moved to the left against the action of a spring 39, by means of a handle 37. The sleeve 28 is connected by a rod 41 to a sleeve 44 slidably mounted on the other end of the shaft 20, and provided with a projection 45 which engages a projection 49 of a fixed collar 48 on a shaft 46, which carries at its end the usual looper 51. A spiral spring 55 is fastened at its ends to the collar 48 and to a drum 53, loosely mounted on the shaft and acted on by a brake consisting of levers 57, 58, Fig. 3, pivoted together at 59 and provided with an adjusting- screw 65. When the shafts 20, 46 are set in rotation, the needle and looper are operated, and the spring 55 is wound up, but when these shafts are thrown out of operation, the needle is stopped and the spring 55 reverses the direction of rotation of the looper to cause a knife to cut the thread, the reverse motion of the looper being stopped by a tooth 67 on the collar 48 contacting with a pawl 68. The spring 55 may be replaced by a weight. The operation of the shafts 20, 46 may be controlled automatically by means of a projection 84 on the handle 37 and an adjustable cam 75 on a plate 74 carried by a gear-wheel 71 driven from the shaft 1. When continuous stitching is required, the handle 37 is pushed to the left until a bevelled projection 97 springs under a hooked arm 96 on a handle 93. and when the thread is to be cut. the handle 93 is raised until a pawl 95 at its inner end rests on the boss 26, and descends the step of a cam on the boss. The projection 97 is thus freed, and the spring 39 pulls over the handle 37 to stop the sewing and cause the cotton to be cut. When continuous feeding without stitching is required, the plate 74 carrying the cam 75 is allowed to be raised by a spring 83, Fig. 5, by releasing an arm 79 from a hook 81.